Telephone call-bell system



(No Model.) 2 SheetsSheet 1.

P. E. FISHER.

- TELEPHONE CALL B LL SYSTEM.

No. 383,563. Patented May 29, 1888.

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(No Model.) 2 Sheets-Sheet 2.

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TELEPHONE CALL BELL SYSTEM. No. 383,563. Patented May 29, 1888.

In @8107"; 61.50 'i I -l 0 'r FRANK E. FISHER, OF DETROIT, MICHIGAN.

TELEPHONE CALL-BELL SYSTEM.

SPECIFICATION forming part of Letters Patent No. 383,563, dated May 29, 1888.

' Application filed September 15, I885. Serial No. 177,177. (No model.)

To all whom it may concern:

Be it known that I, FRANK E. FIsHER, of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in Telephone Gall-Bell Systems, of which the following is a specification.

My invention consists in a new and useful system of telephone call-bells, hereinafter fully set forth and claimed, and is designed to permit the use of two ormore telephones in cir cuit without ringing the bells of all the telephones to call any one of them.

In an application for a patent filed August 14., 1885, Serial No. 174,417, I described my invention as used with only a single linewire, and the invention embodied in this application differs from that only in the use of two line-wires, one for a talking-circuit and one for a bell-operating circuit. The object of this arrangementis to reduce the resistance of the talking-circuit.

Figure l is an elevation of the circuitin the exchange, and with three telephone-stations in circuit; and Fig. 2 is an elevation with only one telephone, showing the connection of the talkingcircuit with the telephone.

L L represent two line-wires, L being the talking-circuit and L the bell-operating circuit.

T represents a telephone apparatus, only the call-bell being shown in Fig. 1.

It represents a receiving-telephone. A represents an annunciator,0f the kind commonly used in exchanges.

P represents a calling-key; I, a telephoneline switch,o f any kind used in telephone-exchanges, and P a key ordinarily used to connect a subscribers line with the operators telephone or with the generator.

The mechanism whereby the operators telephone and generator are connected with the subscribers line is old and well understood; hence does not require detailed descrip tion.

M represents an electric motor constructed exactly as described in my former application, above mentioned, on which is a train of wheelwork, 6 0 de, a lever, f, and an insulated hook headed spring, E, which is in electrical connection with the call bell circuit C of each telephone-station.

N represents a magneto-electric machine in the exchange; H, a magneto in the telephonestation; K, the key for throwing the magneto H into circuit, and S the ordinary telephoneswitch used in telephone apparatus to break the talking-circuit when the receivingtelephone is hung thereon.

G represents the ground.

The line L in the exchange runs from ground, through the operators key P, line-switch P, and the annunciator A, in the ordinary manner, From thence it runs to a contact-piece, stationary, g, which is in contact with the upper arm, h, of the double calling-key P. Line L is fastened to said arm h, as shown in Fig. l, and thence runs to each telephone-station in the circuit, being connected with the binding-postp on each telephone by the wires Z, and being also connected with the coil of the motor M at each telephone by the Wires 0, the wire 0 at the last telephone-station forming the end of line L. The line L is fastened in the exchange to the lower arm, t, of callingkey P, and thence runs to each telephone in circuit, and is connected with the coil of the motor at each telephone by the wires L. The battery-circuit in the exchange ends in two contact-pieces, o 0, so placed as to come in contact with the respective arms of callingkey P when depressed, as shown in Fig. 1.

The bell-circuit G at each telephone is normally disconnected from the line, but is grounded as usual. It is connected with the insulated spring E, and the lever f is in electrical connection with the line L, so that when the leverfis brought into contact with spring E the bell-circuit O is electrically connected with the line L.

The construction and operation of the motors M having been fully described in my former application, I do not deem detailed description thereof necessary here. To call any given telephone on the circuit-say No. l-the operator depresses calling-key P until the arms thereof come in contact with the contact'pieces 0 o, and this sends a. continuous current from the battery B out through line L, and through the motors M, which are built to work with a continuous current. The circuit is completed through wires 0 and line L. When the rotation of the motors M has brought the leverf on the motor connected with telephone No. 1 into contact with the insulated spring E, carried by said motor,whichisshown by the indicator on the motor M in the exchange, the operator releases calling-key P and stops the current from the battery. This current does not ring any of the bells, which are constructed to work with alternating currents. The operator now, by means of key P and line-switch P throws the magneto N into circuit with line L, and sends an alternating current through said line, which does not opcrate the motors M, but does ring the tele phone-bells; but as the bell-circuit of each telephoneis open, except that in telephonestation No. 1, which has been closed by the contact with lever f, only the bell in that telephone station rings. Having thus called the subscriber who has telephone No. 1, the operator converses with him and connects his line with that of another subscriber in the usual manner. The manner of restoring telephone No. l to its normal condition and breaking the bell-circuit is fully set forth in and forms a part of my former application. When the subscriber talks through his telephone, the talkingcurrents pass through line Lonly, and thus the resistance of the motors, which, when only one line-wire is used, oppose the passage of the talking-currents, is eliminated.

. It will be seen that one line, L, is directly connected with the telephone apparatus in the ordinary way, Without first passing through the coils of the motor M, as is the case with the other line.

What I claim as my invention, and desire to secure by Letters Patent, is-

1." In combination with a telephone-station having its bell-circuit normally open, an electric motor constructed to work with a continuous current, and adapted, when set in mo tion, to close said bell-circuit, a line-Wire connected with said motor,and a second 1ine-wire, also connected with said motor and with the telephone, substantially as set forth.

2. In combination with a line-wire, two or more telephone-stations connected with said line wire', and each having its bell-circuit normally open, and a continuous-current electric motor situated at each telephone and adapted to close the bell-circuit thereof, and a second line-wire, not connected directly with the telephones, said motors being connected in multiple arc with said two'linewires.

3. In combination with two or more telephones, a continuous-current electric motor located near each telephone and adapted to close the bell-circuit thereof, and two linewires connected with each other at the farther telephone, said motors being arranged in multi ple arc in said line-wires, and said telephones being connected with one of said line-wires, substantially as shown and described.

FRANK E. FISHER.

Witnesses:

SUMNER OoLLINs, GEO. H. LOTHROP. 

